You need land owner permission to access the private road past the white gate. If you do not have their permission it is about 15 km in and back.
We love this trail and try to do it yearly. It is a lovely walk through the woods for the majority of the walk. It is not until the last km or so that you are walking up a steep granite dome. However once you reach the top it is magnificent! We heard loons in all throughout the evening and early morning . It was magical. The light pollution is little, so perfect for night photos. You can see the city of St John and the Bay of Fundy in the distance.
For more info go tohttp://www.hikingnb.ca/Trails/LowerSJRiver/GrandBayWestfield/TurtleMountain.html